Yo Bobbyj
Yeah they are a notorious predator on small fish.... thats why fish like Reddies, Perch, Bass, Pike, Barra etc are called Predators, fish are what they live on, they are also canibalistic and control their own numbers.
The reason you get big shoals of small reddies is coz some guys caught the big ones that eat the small ones and didn't put 'em back, so there is nothing to eat the small ones, except for the blokes who ate all the big ones, if you know what I mean....
Nice to see your name again Yorkshire
I'll wait for the back lash